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You searched for: creator:"J. Griffin"
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[texts]The Fesenko groups have finite width - Cornelius J Griffin
We prove that the Fesenko Groups, which occur as natural closed subgroups of the Nottingham Group, have finite width and infinite obliquity.
Downloads: 1
[texts]The Doppler Paradigm and the APEX-EPOS-ORANGE Quandary - James J. Griffin
The experimental detection of the sharp lines of the \ee Puzzle is viewed as a struggle against Doppler broadening. Gedanken experiments which are realistic in zeroth order of detail are analyzed to show that the ORANGE and EPOS/I geometries select narrower slices of a Doppler broadened line than spherically inclusive (APEX and EPOS/II --like) apparati. Roughly speaking, the latter require event-by-event Doppler reconstruction simply to regain an even footing with the former...
Downloads: 1
[texts]The APEX/EPOS Quandary: the Way Out via Low Energy Studies - James J. Griffin
A scorecard summary of the various data of the ``Sharp Lepton Problem'' is presented. The present situation, in which APEX reports ``...no evidence for sharp pairs...'' even as their data exhibits a sharp pair excess near 800 keV, is discussed. Two kinds of low energy experiments utilizing non-heavy ion processes are suggested as means to break the impasse arising from the ambiguity of the present heavy ion data.
Downloads: 1
[texts]APEX: Positive evidence for sharp 800 keV pairs from heavy ion collisions near the Coulomb barrier - James J. Griffin
The best fit to the published APEX U+Th data describes a sharp line of 123 pairs of width 23 keV at 793$\pm$7 keV; also, the data impose a positive 99.0%CL lower bound of 23 sharp pairs. It is therefore untenable to argue from the APEX data against the existence of sharp pairs. Data-only ratios APEX/EPOS pair counts show empirically that the two experiments' pair data are mutually consistent and of comparable statistical potency: conflicts, if any, can be resolved only by other independent evide...
[texts]Comment on "A Search for Narrow Sum Energy Lines in Electron-Positron Pair Emission from Heavy Ion collisions near the Coulomb Barrier" - James J. Griffin
The report of Ahmad et al., states that ``No evidence is found for sharp peaks in the present data.'' But this statement is factually inaccurate. Figure 1 exhibits the APEX' published U + Th ``wedge cut'' data, and background, which show a distinct (3.2 sigma) maximum of 83 excess pair counts in the 20 keV bin near 790 keV. A one-gaussian best fit to this excess reduces chi-squared (for the 21 bins from 500 to 920 keV) by 12.6 from 28.3 to 16.7, and the reduced chi-squared value from 1.41 to 0.9...
[texts]Fermionic Field Theory and Gauge Interactions on Random Lattices - C. J. Griffin
Random-lattice fermions have been shown to be free of the doubling problem if there are no interactions or interactions of a non-gauge nature. However, gauge interactions impose stringent constraints as expressed by the Ward-Takahashi identities which could revive the free-field suppressed doubler modes in loop diagrams. After introducing a formulation for fermions on a new kind of random lattice, we compare random, naive and Wilson fermions in two dimensional Abelian background gauge theory...
Downloads: 1
[texts]Monte Carlo Simulations with Indefinite and Complex-Valued Measures - T D Kieu
A method is presented to tackle the sign problem in the simulations of systems having indefinite or complex-valued measures. In general, this new approach is shown to yield statistical errors smaller than the crude Monte Carlo using absolute values of the original measures. Exactly solvable, one-dimensional Ising models with complex temperature and complex activity illustrate the considerable improvements and the workability of the new method even when the crude one fails.
Downloads: 2
[texts]Simulations with Complex Measures - T D Kieu
Towards a solution to the sign problem in the simulations of systems having indefinite or complex-valued measures, we propose a new approach which yields statistical errors smaller than the crude Monte Carlo using absolute values of the original measures. The 1D complex-coupling Ising model is employed as an illustration.
Downloads: 2
[texts]Tackling the Sign Problem - T D Kieu
To tackle the sign problem in the simulations of systems having indefinite or complex-valued measures, we propose a new approach which yields statistical errors smaller than the crude Monte Carlo using absolute values of the original measures. The 1D complex-coupling Ising model is employed as an illustration.
Downloads: 2
[texts]How Do Fermions Behave on a Random Lattice? - C J Griffin
Comparing random lattice, naive and Wilson fermions in two dimensional abelian background gauge field, we show that the doublers suppressed in the free field case are revived for random lattices in the continuum limit unless gauge interactions are implemented in a non--invariant way.
Downloads: 1
[texts]Fermion Doubling and Gauge Invariance on Random Lattices - C J Griffin
Random-lattice fermions have been shown to be free of the doubling problem if there are no interactions or interactions of a non-gauge nature. On the other hand, gauge interactions impose stringent constraints as expressed by the Ward-Takahashi identities which could revive the free-field suppressed doubler modes in loop diagrams. Comparing random lattice, naive and Wilson fermions in two dimensional abelian background gauge theory, we show that indeed the doublers are revived for random lattice...
Downloads: 2
[texts]Simulations of Deep Extra-galactic Surveys with Herschel-SPIRE - T. J. Waskett
The SPIRE Photometer Simulator reproduces the entire Herschel-SPIRE system in a modular IDL program. Almost every aspect of the operation of SPIRE can be investigated in a systematic way to ensure that observations are performed in the most efficient way possible when Herschel flies. This paper describes some of the work done with the Simulator to help prepare for large observing programmes such as deep extra-galactic, high-redshift surveys.
Downloads: 6
[texts]New clues on outburst mechanisms and improved spectroscopic elements of the black-hole binary V4641 Sagittarii - C. Lindstrom
We present spectroscopic observations of the black-hole binary V4641 Sagittarii, obtained between 4th July 2004 and 28th March 2005, which cover the minor outburst of the star in early July 2004 and quiescence variations on 19 nights scattered over six months. During the outburst, the star peaked approximately 3 magnitudes brighter than usual, and our spectra were dominated by broad hydrogen, helium and iron emission lines...
Downloads: 2
[texts]Snow sampling survey in the vicinity of Wilanour Resources Limited, Cochenour, March, 1982 - Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 38
[texts]Air quality studies in the vicinity of Great Lakes Ceramics Inc., Rosslyn Village, Ontario, 1985-86 - Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 36
[texts]Snow sampling survey in the vicinity of Kimberly-Clark of Canada Limited and Weldwood of Canada Limited, Longlac, February, 1983 - Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 37
[texts]Air quality in the vicinity of the fly-ash disposal area at Ontario Hydro's Thunder Bay generating station, 1982 - Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 41
[texts]Pre-operational snow sampling survey in the vicinity of Minnova Inc., Schreiber, Ontario, 1987 - Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 40
[texts]Phytotoxicology investigations in the vicinity of the Sunshine Rail Siding, May-August, 1979 - Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 45
[texts]Snow sampling survey in the vicinity of Pluswood Manufacturing Limited, Atikokan, February, 1983 - Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 41
[texts]Snow sampling survey in the vicinity of Great Lakes Forest Products Limited, Thunder Bay, February, 1985 - Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 41
[texts]Snow sampling survey near Canadian Pacific Forest Products Limited, Thunder Bay, February, 1989 - Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 53
[texts]Air quality investigations in the vicinity of Inco Metals Limited, Shebandowan, 1979-80 - Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 38
[texts]Air quality studies in the vicinity of Thunder Tile Limited, Rosslyn, 1982 - Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 46
[texts]Snow sampling survey in the vicinity of Domtar Packaging Limited, Red Rock, Ontario, 1986 - Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 41
[texts]Dustfall and snow sampling in the vicinity of James River-Marathon Limited, Marathon, 1985-86 [Dustfall and snow sampling survey in the vicinity of James River-Marathon Limited, Marathon, 1985-86] - Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 41
[texts]Snow sampling survey in the vicinity of two mineral assay laboratories in the Red Lake area, 1988 - Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 49
[texts]Snow sampling survey in the vicinity of Noranda's GECO Mine, Manitouwadge, January, 1982 - Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 57
[texts]Terrestrial and atmospheric deposition studies in the vicinity of the Ontario Hydro Thermal generating station, Atikokan, 1986 - Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 51
[texts]Air quality studies in the vicinity of the Ontario Hydro thermal generating station, Atikokan, 1981 - Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 46
[texts]Air quality studies in the vicinity of Kimberly-Clark of Canada Limited and Weldwood of Canada Limited, Longlac, Ontario - Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 111
[texts]Deposition of metals in the vicinity of Mattabi Mines Limited, Ignace, 1986 - Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 50
[texts]Moss exposure experiment in the vicinity of Northern Wood Preservers Incorporated and Canadian National Railway Ore Dock, Thunder Bay, 1981 - Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 44
[texts]Moss bag exposure survey in the vicinity of the CPR concentrate transhipment facility, Schreiber, 1987-88 - Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 67
[texts]Numerical calculations of a high brilliance synchrotron source and on issues with characterizing strong radiation damping effects in non-linear Thomson/Compton backscattering experiments - A. G. R. Thomas
A number of theoretical calculations have studied the effect of radiation reaction forces on radiation distributions in strong field counter-propagating electron beam-laser interactions, but could these effects - including quantum corrections - be observed in interactions with realistic bunches and focusing fields, as is hoped in a number of soon to be proposed experiments? We present numerical calculations of the angularly resolved radiation spectrum from an electron bunch with parameters simil...
Downloads: 2
[texts]Magneto-photoluminescence studies of Zn_{1-x}Mn_xTe/ZnTe multiple quantum-well and quantum dot structures - Ivan J. Griffin
Wide quantum dots were fabricated from multiple quantum well structures based on Zn_{1-x}Mn_xTe/ZnTe (x = 0.076) dilute magnetic semiconductors and were investigated via photoluminescence (PL) in a magnetic field. Calculations taking into account the strain in the two types of structure enabled the PL transitions to be identified and show that the dominant emission in the MQWs is from heavy-hole (hh) excitons whereas in the quantum dots, the removal of the strain in the barrier layers generates ...
Downloads: 5
[texts]Snow sampling and dustfall survey in the vicinity of Proboard Ltd., Atikokan, February 1988 - Pfeiffer, H. N.|Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 41
[texts]Snow sampling survey in the vicinity of Kimberly-Clark of Canada Ltd. and Weldwood of Canada Ltd., Longlac, Ontario 1988 - Pfeiffer, H. N.|Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 36
[texts]Snow sampling survey in the vicinity of Boise Cascade Canada Ltd., Kenora, February 1988 - Pfeiffer, H. N.|Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 53
[texts]Vegetation and snow sampling surveys near Hemlo gold mines, 1988 - Racette, D. J.|Griffin, H. D.|Pfeiffer, H. N.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 49
[texts]Snow sampling survey in the vicinity of Minnova Inc., Schreiber, 1988 - Pfeiffer, H. N.|Racette, D. J.|Griffin, H. D.|Ontario Ministry of the Environment. Northwestern Region. Technical Support Section.

Downloads: 46
[texts]Lunar Lander Conceptual Design - Caesar Mamplata

Keywords: design; conceptual design; lunar lander
Downloads: 59
[texts]Binarity and multiperiodicity in high-amplitude delta Scuti stars - A. Derekas
We present our first results for a sample of southern high-amplitude delta Scuti stars (HADS), based on a spectrophotometric survey started in 2003. For CY Aqr and AD CMi, we found very stable light and radial velocity curves; we confirmed the double-mode nature of ZZ Mic, BQ Ind and RY Lep. Finally, we detected gamma-velocity changes in RS Gru and RY Lep
[texts]SCUBA: A common-user submillimetre camera operating on the James Clerk Maxwell Telescope - Wayne S. Holland
SCUBA, the Submillimetre Common-User Bolometer Array, built by the Royal Observatory Edinburgh for the James Clerk Maxwell Telescope, is the most versatile and powerful of a new generation of submillimetre cameras. It combines a sensitive dual-waveband imaging array with a three-band photometer, and is sky-background limited by the emission from the Mauna Kea atmosphere at all observing wavelengths from 350 microns to 2 mm...
[texts]Extragalactic Science with Herschel-SPIRE - M. J. Griffin
SPIRE, the Spectral and Photometric Imaging Receiver, is one of three instruments to fly on ESA's Herschel Space Observatory. It contains a three-band imaging photometer operating at 250, 360 and 520 microns, and an imaging Fourier Transform Spectrometer (FTS) covering 200-670 microns. It will be used for many extragalactic science programmes, a number of which will be implemented as Herschel Key Projects...
Downloads: 10
[texts]Isolated starless cores in IRDCs in the Hi-GAL survey - L. A. Wilcock
In a previous paper we identified cores within infrared dark clouds (IRDCs). We regarded those without embedded sources as the least evolved, and labelled them starless. Here we identify the most isolated starless cores and model them using a three-dimensional, multi-wavelength, Monte Carlo, radiative transfer code. We derive the cores' physical parameters and discuss the relation between the mass, temperature, density, size and the surrounding interstellar radiation field (ISRF) for the cores...
[texts]First ground-based 200-um observing with THUMPER on JCMT - sky characterisation and planet maps - D. Ward-Thompson
We present observations that were carried out with the Two HUndred Micron PhotometER (THUMPER) mounted on the James Clerk Maxwell Telescope (JCMT) in Hawaii, at a wavelength of 200 um (frequency 1.5 THz). The observations utilise a small atmospheric window that opens up at this wavelength under very dry conditions at high-altitude observing sites. The atmosphere was calibrated using the sky-dipping method and a relation was established between the optical depth, tau, at 1.5 THz and that at 225 G...
[texts]First results from the Herschel Gould Belt Survey in Taurus - J. M. Kirk
The whole of the Taurus region (a total area of 52 sq. deg.) has been observed by the Herschel SPIRE and PACS instruments at wavelengths of 70, 160, 250, 350 and 500 {\mu}m as part of the Herschel Gould Belt Survey. In this paper we present the first results from the part of the Taurus region that includes the Barnard 18 and L1536 clouds. A new source-finding routine, the Cardiff Source-finding AlgoRithm (CSAR), is introduced, which is loosely based on CLUMPFIND, but that also generates a struct...
Downloads: 8
[texts]The M16 molecular complex under the influence of NGC6611. Herschel's perspective of the heating effect on the Eagle Nebula - T. Hill
We present Herschel images from the HOBYS key program of the Eagle Nebula (M16) in the far-infrared and sub-millimetre, using the PACS and SPIRE cameras at 70{\mu}m, 160{\mu}m, 250{\mu}m, 350{\mu}m, 500{\mu}m. M16, home to the Pillars of Creation, is largely under the influence of the nearby NGC6611 high-mass star cluster. The Herschel images reveal a clear dust temperature gradient running away from the centre of the cavity carved by the OB cluster...
Downloads: 2
[texts]The Herschel view of massive star formation in G035.39--00.33: Dense and cold filament of W48 undergoing a mini-starburst - Q. Nguyen Luong
The filament IRDC G035.39--00.33 in the W48 molecular complex is one of the darkest infrared clouds observed by \textit{Spitzer}. It has been observed by the PACS (70 and 160\,$\micron$) and SPIRE (250, 350, and 500\,$\micron$) cameras of the \textit{Herschel} Space Observatory as part of the W48 molecular cloud complex in the framework of the HOBYS key programme. The observations reveal a sample of 28 compact sources (deconvolved FWHM sizes $$$20 \msun$...
Downloads: 2
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